tests: Cope with broken Libgcrypt versions

* common/t-sexputil.c (test_ecc_uncompress): Ignore unknwon curve
errors.
--

For unknown reasons some versions of Fedora or RHEL provide a patched
version of Libgcrypt with Brainpool support removed.  We better ignore
this error because it is a regression in 2.2.28 although that older
versions could not used Brainpool keys.

GnuPG-bug-id: 5502
Signed-off-by: Werner Koch <[email protected]>

1 files changed, 27 insertions, 11 deletions

diff --git a/common/t-sexputil.c b/common/t-sexputil.c
index a1a9d89bb..8da97609d 100644
--- a/common/t-sexputil.c
+++ b/common/t-sexputil.c
@@ -460,17 +460,33 @@ test_ecc_uncompress (void)
       if (bbuf)
         {
           err = uncompress_ecc_q_in_canon_sexp (bbuf, bbuflen, &rbuf, &rbuflen);
-          if (err)
-            fail2 (idx,err);
-          if (!rbuf)
-            fail (idx);  /* Not converted despite a need for it. */
-
-          /* log_printcanon ("  orig:", abuf, abuflen); */
-          /* log_printcanon ("  comp:", bbuf, bbuflen); */
-          /* log_printcanon ("uncomp:", rbuf, rbuflen); */
-
-          if (rbuflen != abuflen || memcmp (rbuf, abuf, abuflen))
-            fail (idx);
+          if (gpg_err_code (err) == GPG_ERR_UNKNOWN_CURVE)
+            {
+              static int shown;
+              fprintf (stderr, "%s:%d: test %d failed: %s - ignored\n",
+                       __FILE__,__LINE__, idx, gpg_strerror (err));
+              if (!shown)
+                {
+                  shown = 1;
+                  fprintf (stderr, "This is likely due to a patched"
+                           " version of Libgcrypt with removed support"
+                           " for Brainpool curves\n");
+                }
+            }
+          else
+            {
+              if (err)
+                fail2 (idx,err);
+              if (!rbuf)
+                fail (idx);  /* Not converted despite a need for it. */
+
+              /* log_printcanon ("  orig:", abuf, abuflen); */
+              /* log_printcanon ("  comp:", bbuf, bbuflen); */
+              /* log_printcanon ("uncomp:", rbuf, rbuflen); */
+
+              if (rbuflen != abuflen || memcmp (rbuf, abuf, abuflen))
+                fail (idx);
+            }
         }
 
       xfree (abuf);